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What is the Wait Type "QDS_Shutdown_Queue" referring to?

I'm gathering wait types on a load test environment, and the second biggest wait type is QDS_SHUTDOWN_QUEUE. The stats are coming from sys.dm_os_wait_stats, but I can't find any documentation that explains what that particular type means.

I'm running SQL Server 2014, SP1 on a physical Windows 2008 R2 instance (no VM involved).